> I am trying to render some translucent objects
If you're material consists of only one color and density, you can use
attenuation:
http://povray.org/documentation/view/3.6.1/416/
Otherwise, for more control over the effect, use media, especially
absorbing and scattering media:
http://povray.org/documentation/view/3.6.1/419/
HTH, just ask if you got further questions!
Florian